Work-holder for grinding and the like machines



N R. HARMAN. WORK HOLDER FOB GRINDING AND THE LIKE MACH! NES.

Patented July 5 APPLICATION FILED FEB. 27, I920.

llllfll'n RQBERT KHAN, @F Y0: iii

- BISHQPSE: i o:

, ENGLAND, ASSIGNOR T0 '1. COOKE & SONS, LIMITED, @E YORK, ENGLAND.

VTURK-HQWER IJOR GRINDING AND THE L rraonrnrs.

Toall whom it may concern." i

Be it known that l, Roeisnr HARMAN, a subject of the King of GreatBritain, residin at York, in the county of York and King%om of Enland,'have inventedcertain new and usefu Improvements in Work- Holdersfor Grinding and the like Machines, of which the followin is aspecification.

he present invention relates to an im-. proved work holder for theholding of articles such as gages having spherical ends which are to beground or otherwise machined on a machine or the like tool.

The work holder of the present invention comprises a socket adapted tobe connected to the head-stock of a lathe or grinding machine,-forinstance, by means of the usual orse or the like taper connection, whichholder isadapted to receive a gage element rotating about theaxis of thetool holder;

by the rotation of this latter and also about its own axis. 1

"adapted to be The invention is more particularly described withreference to the accompanying a drawlngs showing one form ofconstruction in sectional elevation;

bar gage such as 1, the ends of which are to be ground to cylindricalshape by means of an locked within a sleeve holder 3, by means of a setscrew 4. This sleeve 3, is mounted by means of a pair tion bearings 5,in a body 6, connected with a spindle 7, b which it can be "locked tothe rotating head stock spindle of a lathe or grindins machine.

he s ee've 3, is provided with an internal bevel ring 8, engaging withascrown wheel 9, on a shaft 10, supported b means of a ball bearing 11,forming a portion of the body 6. The shaft 10 can no supported on thetail stock of the specification of Letters Patent. Application filedFebruary 27, 1920. Serial lilo.

ving machine comprising emery wheel 2, or the like is of anti fric-' ina body or s eeve 12,

Patented July 5, 1921, 361,877..

. lathe against rotation for instance by a dog passing through aperforation 13, in the on of this. t

It will be seen thei fore that as the spin dle 7, rotates while theshaft 10 is stationary, the work will not only be rotating about its ownaxis but will also rotate about an axis atright angles thereto, namely,about the axis of the spindle 7, consequently the ends of the work willbe ground to a spherical form of a radius equal to the distance of theemery wheel from the axis of rotation of the holder.

if declare that what I claim is 1. As an article of manufacture, aholder for a piece of work, means to secure the work in said holder,with both ends permanently exposed for operatiort, a spindle carryingsaid holder, means to continuously rotate saidspindle, and means tocontinuously rotate said holder in said spindle about an axis at rightangles to the axis of rotation of the spindle. v

2-. As an article of manufacture, a grinda headstock, a tailstock, arotating spind e, in said headstock, ashaft, means to rigidly connectsaid shaft to .said tailstock, bearings for said spindleon the shaft, awork holder, meansto secure an article in said holder, bearings for saidholder on said spindle, gearing between said holder and said shaftwhereby the holder is rotated continuously about an axis at right an lesto the axis of the spindle.

n witness whereof, I have hereunto signed my name this 11th day ofFebruary, 1920,

in the presence of two subscribing witnesses.

. ROBERT HARMAN.

Witnesses:

Romano Les-mm, Crime G. Crrsswrml.

